PATIENT CHARACTERISTICS: Age: Adult Performance status: Karnofsky 60-100% Life expectancy: Not specified Hematopoietic: Absolute neutrophil count at least 1,000/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin less than 2 times upper limit of normal (ULN) SGOT less than 2 times ULN Alkaline phosphatase less than 2 times ULN Renal: Not specified Other: No other active invasive malignancy No inability to receive subcutaneous injection No inability to tolerate oral medication